Hou‐Tong Chen
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View article: Programmable low-coherence wavefronts for enhanced localization
Programmable low-coherence wavefronts for enhanced localization Open
Engineering the properties of electromagnetic wavefronts has become essential to imaging, wireless security, sensing, and wireless communication. In particular, wavefronts that exhibit low spatial coherence can enable sensing functionaliti…
View article: Intra‐ and interobserver agreement of proposed objective transvaginal ultrasound image‐quality scoring system for use in artificial intelligence algorithm development
Intra‐ and interobserver agreement of proposed objective transvaginal ultrasound image‐quality scoring system for use in artificial intelligence algorithm development Open
Objectives The development of valuable artificial intelligence (AI) tools to assist with ultrasound diagnosis depends on algorithms developed using high‐quality data. This study aimed to test the intra‐ and interobserver agreement of a pro…
View article: Quantum Frequency Combs with Path Identity for Quantum Remote Sensing
Quantum Frequency Combs with Path Identity for Quantum Remote Sensing Open
Quantum sensing promises to revolutionize sensing applications by employing quantum states of light or matter as sensing probes. Photons are the clear choice as quantum probes for remote sensing because they can travel to and interact with…
View article: Audio misinformation encoding via an on-phone sub-terahertz metasurface
Audio misinformation encoding via an on-phone sub-terahertz metasurface Open
We demonstrate a wireless security application to protect the weakest link in phone-to-phone communication, using a terahertz metasurface. To our knowledge, this is the first example of an eavesdropping countermeasure in which the attacker…
View article: Few-Layer Terahertz Metasurfaces for Antireflection, Polarization Conversion & Flat Lens
Few-Layer Terahertz Metasurfaces for Antireflection, Polarization Conversion & Flat Lens Open
This document discusses materials and nanotechnologies presented at the OSA Subwavelength Photonics Incubator conference.
View article: Superconductors and Complex Transition Metal Oxides for Tunable THz Plasmonic Metamaterials
Superconductors and Complex Transition Metal Oxides for Tunable THz Plasmonic Metamaterials Open
The outline of this presentation are: (1) Motivation - Non-tunability of metal metamaterials; (2) Superconductors for temperature tunable metamaterials; (3) Ultrafast optical switching in superconductor metamaterials; (4) Controlling the c…
View article: Ultrafast optical control of terahertz surface plasmons in subwavelength hole-arrays at room temperature
Ultrafast optical control of terahertz surface plasmons in subwavelength hole-arrays at room temperature Open
Extraordinary optical transmission through subwavelength metallic hole-arrays has been an active research area since its first demonstration. The frequency selective resonance properties of subwavelength metallic hole arrays, generally kno…
View article: Superconducting terahertz metamaterials
Superconducting terahertz metamaterials Open
During the past ten years subwavelength metallic structures have enabled metamaterials exhibiting exotic physical properties that are not possible or difficult to realize using naturally occurring materials, This bottom-up metamaterial app…
View article: Terahertz antireflection coatings using metamaterials
Terahertz antireflection coatings using metamaterials Open
We demonstrate terahertz metamaterial antireflection coatings (ARCs) that significantly reduce the reflection and enhance the transmission at an interface of dielectric media. They are able to operate over a wide range of incidence angles …
View article: Ultrafast optical control of terahertz surface plasmon polariton in subwavelength hole-arrays at noon temperature
Ultrafast optical control of terahertz surface plasmon polariton in subwavelength hole-arrays at noon temperature Open
We demonstrate ultrafast optical control of surface plasmon assisted terahertz (THz) transmission in a subwavelength metallic hole array on a semiconductor substrate. The transient photoconductivity of the substrate allows modulation of th…
View article: Hybrid Metameterials Enable Fast Electrical Modulation Of Freely Propagating Terahertz Waves
Hybrid Metameterials Enable Fast Electrical Modulation Of Freely Propagating Terahertz Waves Open
We demonstrate fast electrical modulation of freely propagating THz waves at room temperature using hybrid metamaterial devices. the devices are planar metamaterials fabricated on doped semiconducor epitaxial layers, which form hybrid meta…
View article: Surface plasmons in terahertz metamaterials
Surface plasmons in terahertz metamaterials Open
We characterize terahertz metamaterials by applying apertureless near-field microscopy with a bandwidth that covers the entire spectral response of the structures. The observations agree with the interpretation of the fundamental mode of t…
View article: Chalcogenide phase-change material advances programmable terahertz metamaterials: a non-volatile perspective for reconfigurable intelligent surfaces
Chalcogenide phase-change material advances programmable terahertz metamaterials: a non-volatile perspective for reconfigurable intelligent surfaces Open
Terahertz (THz) waves have gained considerable attention in the rising 6G communication due to their large bandwidth. However, the cost and power consumption become the major constraints for the commercialization of 6G THz systems as the f…
View article: Surface plasmon-cavity hybrid state and its graphene modulation at THz frequencies
Surface plasmon-cavity hybrid state and its graphene modulation at THz frequencies Open
Fabry–Pérot (F–P) cavity and metal hole array are classic photonic devices. Integrating F–P cavity with holey metal typically enhances interfacial reflection and dampens wave transmission. In this work, a hybrid bound surface state is foun…
View article: Metasurface-based varifocal Alvarez lens at microwave frequencies
Metasurface-based varifocal Alvarez lens at microwave frequencies Open
Lenses with a tunable focus are highly desirable but remain a challenge. Here, we demonstrate a microwave varifocal meta-lens based on the Alvarez lens principle, consisting of two mechanically movable tri-layer metasurface phase plates wi…
View article: Reflective metasurfaces for broadband terahertz linear-to-circular polarization conversion and circular dichroism spectroscopy
Reflective metasurfaces for broadband terahertz linear-to-circular polarization conversion and circular dichroism spectroscopy Open
Metasurface polarization convertors permit conversion of an input linear polarization to right- or left-handed circular polarization based on the orientation of the input linear polarization, over a broad bandwidth and with high efficiency…
View article: Light-Driven Nanoscale Vectorial Currents
Light-Driven Nanoscale Vectorial Currents Open
Controlled charge flows are fundamental to many areas of science and technology, serving as carriers of energy and information, as probes of material properties and dynamics, and as a means of revealing or even inducing broken symmetries. …
View article: Ultrafast terahertz emission from emerging symmetry-broken materials
Ultrafast terahertz emission from emerging symmetry-broken materials Open
Nonlinear optical spectroscopies are powerful tools for investigating both static material properties and light-induced dynamics. Terahertz (THz) emission spectroscopy has emerged in the past several decades as a versatile method for direc…
View article: Plasmonic Terahertz Devices and Sensors Based on Carbon Electronics
Plasmonic Terahertz Devices and Sensors Based on Carbon Electronics Open
Tunable terahertz (THz) photonic devices are imperative in a wide range of applications ranging from THz signal modulation to molecular sensing. One of the currently prevailing methods is based on arrays of metallic or dielectric resonator…